#5 and #6 are very interesting. We particularly like the stylized "G" and that we can use the overall graphic in a single color. What about making the stars gold?
If we decide on your logo, could we also get JUST the "G" in the shield (like #6)? It would make a great identifier on stamps, stickers, etc. Because of the distinct shield, #6 is looking more and more promising.
Please ignore the ranking numbers. We'll arrange them more accurately later today.